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Ok, I`m stuck here.
Looking at my toolholders for my VMC300, there`s a difference between them, and the toolholders at Coventry Toolholders.
(http://www.coveng.co.uk/group/covent...sy-change.html)
Mine has a machined groove in the top flange, and i do believe for my ATC holder(spring loaded fork). Se Attached Picture.
However the toolholders at Coventry has not :-\
Looking at the video on youtube, it seems they have 2 types. One With just the 2 notches on each side, and one With additional groove for a ATC Version With spring loaded fork.

Am i completely off track here, or is my assumption correct ?
Are there any drawings in some far away corner of the internet on these toolholders if i would make them myself ?
I could of course make my own drawing and plot it in.
They are a bit expencive if you need say more than 5-10pcs ER32 Easy Change Collet Chucks..

Don`t know if Coventry Toolholders is the correct one, but i do beleive to remember that name from another post somewhere here in the forum.
Took a Picture of it, and measured som of the Critical parts.
By the way i took a lokk at the link you gave me, but could not find anything even Close to it.

Yes m_c it does, but the closest i can find is the Easychange toolholder from Coventry.
The diameter on top is 22mm, and yes i think it`s a standard pull stud.
There`s 2 ways i can solve this. One is to send my measurements to Coventry Toolholders for confirmation and ask if they have the Version with the groove in the top flange.
And if the dimensions are the same but without the groove, it should be fairly simple to fix that with my lathe.
The second solution is to make them myself in the lathe. but that one is manual so far(which will produce a lot work work).
I got a bunch of the standard endmill holders with sidelock that i could sell out since i like the onces for collet chucks better.

I suspect you mean Coventry Easy Change magicniner?
I`m adding a sketch i made today With all Critical measurements.
.
.
Will also send it to Coventry Toolholders and have them confirm all measurements and explanation as to why the groove is missing in the top flange in their catalog.
Believe the flange is a special Boxford solution on their first ATC`s.. or something...
Would be interesting to know if there`s anybody that would buy any of my bearly used standard Easy Change toolholder like the on in the Picture though.
I`m more into collet chuck toolholders and the Shell Mill Holders.

explanation as to why the groove is missing in the top flange in their catalog

Because it's not a Coventry Easy Change tool holder.

I've just been and compared one to a BT30, and the Easy Change holders have a steeper taper, which would be correct as the Easy Change holder doesn't use a self locking taper, whereas the BT taper usually is self locking and needs force to remove it.
Unfortunately the battery is flat in my angle calipers and I don't have a spare, so can't give an exact angle.

Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

I compared it to the BT30 as well and the angle is different.
Besides the taper length on BT30 is 50,4mm(including the 2mm notch), whereas my mystery taper lengt is 32,75mm.
If it`s not Coventry i`m stuck, but i guess i will receive an answer from them by next week.